Dynamic Groups

Dynamic groups specify one or more URL search filters. All entries that
match the URL search filters are members of the group. Membership of a dynamic
group is defined each time the filters are evaluated. Dynamic groups use one
of the following object class and attribute pairs:

The groupOfURLs object class, with the memberURL attribute

The groupOfUniqueNames object class, with
the uniqueMember attribute

The group members are listed either by one or more filters represented
as LDAP URL values of the memberURL attribute or by one
or more DNs as values of the uniqueMember attribute.